2005 Toyota Avalon, about 100K miles on it. I am

2005 Toyota Avalon about 100K miles on it. I am original owner. I don't recall seeing a light appear with an icon and the word check in yellow. The check engine light normally comes on for service and it is red. What does this mean?

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Make sure that is not a light from the shift button options on the transmission check your owners manual about how to use the transmission. I would go to autozone and read the codes and find if they are trans codes that year of car is famous for the computer that shifts the transmission failing there is a recall that toyota has to replace that for free up to 100k after 100k your on your own

I just had the same problem with my 2001 avalon. AutoZone told me it was code Po171 and the car was running lean. You don't have to take it to the shop right away but don't wait too long. Took it and the mechanic had to clear out the mass air flow on top of the air bonx (sp?). I guess if this vent gets clogged it can strain the engine? Hope this helps!

Go to AutoZone and ask them to scan the ECU for codes since you have a check light on. They'll do it for free (a dealer usually gets an hour's labor to do this), and they'll give you a listing of the code and its definition. Post those up and then we can diagnose.